scholarly journals Antioxidant activity in different parts of roselle (Hibiscus sabdariffa L.) extracts and potential exploitation of the seeds

2010 ◽  
Vol 122 (4) ◽  
pp. 1055-1060 ◽  
Author(s):  
Norhaizan Mohd-Esa ◽  
Fong Shin Hern ◽  
Amin Ismail ◽  
Chew Lye Yee
Keyword(s):  
Antioxidant Activity ◽  
Hibiscus Sabdariffa ◽  
Potential Exploitation ◽  
Different Parts

Uşak İli’nden Toplanan Taxus Baccata (L) Türünün Metanol Ekstresinin Yaprak, Dal ve Meyvesinde Biyolojik Aktivitenin Belirlenmesi

2019 ◽  
Vol 7 (10) ◽  
pp. 1533
Author(s):  
Yasemin Karafakıoglu
Keyword(s):  
Antioxidant Activity ◽  
Methanol Extract ◽  
Phenolic Content ◽  
Maximum Amount ◽  
Chemical Components ◽  
Taxus Baccata ◽  
Dpph Radical ◽  
Flavonoid Content ◽  
Future Studies ◽  
Different Parts

Taxus species in different parts of the world prevent the formation of hepatoprotective, anticoagulant, antiulcerogenic, anti-coagulant, antifungal and tumour cells. In this study, biological activity studies were performed on the leaves, branches and fruits of the methanol extract of Taxus baccata L. species collected from Sivaslı district of Uşak province. The methanol extract of the T.baccata species, the total amount of phenolic content of the sample was found to be 14.76 mg GAEQ/1g dry sample in the highest leaves. In T.baccata methanol extract, the maximum amount of flavonoid content was 0.468±mg QE/g dry sample. Antioxidant activity value as DPPH radical; % inhibition value was found as 93.21%. Based on the results; It can be concluded that the leaves of T.baccata have higher antioxidant activity than fruits and branches. Future studies need to explore the chemical components contained in the T.baccata species to determine and investigate in further detail.

Concentration of roselle (Hibiscus sabdariffa L) and sucrose in beverages: Effects on physicochemical characteristics and acceptance

2020 ◽  
pp. 108201322097379
Author(s):  
Jahir Antonio Barajas-Ramírez ◽  
Ana Luisa Gutiérrez-Salomón ◽  
Sonia Guadalupe Sáyago-Ayerdi
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
High Intensity ◽  
Physicochemical Characteristics ◽  
Hibiscus Sabdariffa ◽  
Color Parameters ◽  
Low Intensity ◽  
Red Color

The calyces of roselle ( Hibiscus sabdariffa L.) are used to make a refreshing drink with high content of anthocyanins and other phenolic compounds, although the process for obtaining the beverage is not standardized. In this research it was determined physicochemical characteristics, total soluble polyphenols content, antioxidant activity and acceptance for beverages prepared by decoction at four concentrations of calyces in water (1.0, 2.5, 5.0 and 10.0%) and two concentrations of sucrose (11 and 16%). Color parameters in beverages permitted to describe them as red, which turned darker as the content of hibiscus increased. Total soluble polyphenols content and antioxidant activity were directly correlated with content of calyces in beverages and inversely correlated with pH, which means that beverages with higher content of calyces could be perceived as more acidic and more intense in characteristics associated with hibiscus presence, such as acid, astringent and the presence of intense dark red color, although the higher concentration of sucrose might have contributed to mask slightly the sourness and astringency. Acceptance for hibiscus beverages allowed to observe two segments of consumers, high-intensity and low-intensity likers but both confluence in overall liking values for beverages prepared with 2.5% calyces and 16% sucrose.

scholarly journals Antioxidant, Antimicrobial Activities and Fatty Acid Components of Flower, Leaf, Stem and Seed of Hypericum scabrum

2011 ◽  
Vol 6 (11) ◽  
pp. 1934578X1100601 ◽  
Author(s):  
Ali Shafaghat
Keyword(s):  
Fatty Acids ◽  
Gas Chromatography ◽  
Antimicrobial Activity ◽  
Antioxidant Activity ◽  
Radical Scavenging ◽  
Omega 3 Fatty Acids ◽  
Omega 3 ◽  
Hexane Extracts ◽  
Hypericum Scabrum ◽  
Different Parts

The hexane extracts of flower, leaf, stem, and seed of Hypericum scabrum, which were collected from northwestern Iran, were obtained by extraction in a Soxhlet apparatus. The fatty acids were converted to methyl esters and determined by gas chromatography/flame ionization detector (GC/FID) and gas chromatography/mass spectrometry (GC/MS) systems. The hexane extract from the flower, leaf, stem, and seed contained 39.1%, 43.2%, 29.0%, and 37.6% of omega-3 fatty acids, respectively. The other main components of the flower extract were tetracosane (12.2%) and palmitic acid (9.3%), and that of the leaf extract was palmitic acid (7.4%). The stem and seed extracts contained bis(2-ethylhexyl)phthalate (18.7% and 35.7%), nonacosane (11.7% and 3.9%) and linoleic acid (6.5% and 6.9%) as major components. The hexane extracts of different parts from H. scabrum represent an important source of omega-3 fatty acids in several Hypericum species. The antioxidant activity of all hexane extracts was evaluated by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method. The results indicate that hexane extracts from different parts of H. scabrum possess considerable antioxidant activity. The highest radical scavenging activity was detected in seed, which had an IC50 = 165 μg/mL. The antimicrobial activity of the extracts of those samples were determined against seven Gram-positive and Gram-negative bacteria ( Bacillus subtilis, Enterococcus faecalis, Staphylococcus aureus, S. epidermidis, Escherichia coli, Pseudomonas aeruginosa, and Klebsiella pneumoniae), as well as three fungi ( Candida albicans, Saccharomyces cerevisiae, and Aspergillus niger). The bioassay showed that the oil exhibited moderate antimicrobial activity. This study reveals that the all parts of this plant are attractive sources of fatty acid components, especially the essential ones, as well as of effective natural antioxidants.

scholarly journals The Influence of Different Retting Processes on the Strength of Fibres obtained from Poliostigma raticulatum, Grewia mollis, Cissus populnea and Hibiscus sabdariffa

2015 ◽  
Vol 5 (4) ◽  
pp. 41 ◽  
Author(s):  
Peter Michael Dass ◽  
Ayodele Akinterinwa ◽  
Jibrin Ndahi Adamu ◽  
Shamsu Abba
Keyword(s):  
Tensile Strength ◽  
Focal Point ◽  
Natural Fibres ◽  
Hibiscus Sabdariffa ◽  
Microbial Activities ◽  
Gradual Decline ◽  
Appreciable Change ◽  
Chemical Retting ◽  
Different Parts ◽  
Fibrous Matter

<p class="1Body">The extraction of vegetable fibres from different parts of plants has been a major focal point in the search for natural fibres that would substitute synthetic fibres. Fibres from <em>Poliostigma reticulatum</em>, <em>Grewia mollis,</em> <em>Cissus populnea</em> and<em> Hibiscus sabdariffa</em> were extracted by water and chemical retting. In chemical retting different concentrations of NaOH and NH<sub>4</sub>OH were used. The extracted fibres were further purified and their tensile strength measured. The pH of water was measured as retting progresses and observed to increase as the retting time increases. This was ascribed to the secretion of enzymes by microorganisms as they acted on the mucilaginous matter of the bast with the resultant loosening of the fibres. The tensile strength of the fibres was determined using the Shirley Testometric 220D and was observed to gradual decline as the retting time increases. This was attributed to the continual removal of non-fibrous matter and the freeing of the fibres in the composite. However, beyond the fifth week of retting, no appreciable change in tensile strength was observed. This suggested that most of the non-fibrous matter have been solublized and utilized as source of nutrients and energy by the microorganisms. Acidic metabolites were produced due to microbial activities may have changed the pH of the medium and subsequently hindered their growth. In chemical retting, as the concentration of the medium increases the strength of the fibres decreases to a minimum then remain constant. This was accredited to the breakdown of inter- molecular bonds between non-fibrous substances and the fibres. And subsequently, the non-fibrous components separate from the fibres and dissolved in the medium revealing the actual fibres strength. It was therefore, opined that retted fibres in water, 5% NH<sub>4</sub>OH and 15% NaOH are clearer and lustrous for all sample except those from Kargo<em>.</em></p>

scholarly journals Studies on the Active Components and Antioxidant Activity of the Extracts from Different Parts of Bamboo

2013 ◽  
Vol 25 (11) ◽  
pp. 6354-6360 ◽  
Author(s):  
Yu-Xian Li ◽  
Fang-Rong Cheng ◽  
Yong-Chun Jin ◽  
Ke Yuan
Keyword(s):  
Antioxidant Activity ◽  
Active Components ◽  
Different Parts

scholarly journals TOTAL PHENOLIC CONTENT AND ANTIOXIDANT ACTIVITIES IN CALLUS OF KAEMPFERIA PARVIFLORA

2021 ◽  
Vol 9 (6) ◽  
pp. 77-84
Author(s):  
Zuraida Ab Rahman ◽  
Ayu Nazreena Othman ◽  
Chandradevan A/L Machap ◽  
Amirah Balqis Amir Amran ◽  
Nur Najwa Arifah Basiron
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Content ◽  
Antioxidant Activities ◽  
Total Content ◽  
Total Phenolic ◽  
Dichlorophenoxyacetic Acid ◽  
Kaempferia Parviflora ◽  
Growth Optimization ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Different Parts

Black ginger or is one useful medicinal plant that urges the need to be cultivated widely. This plant has some previous studies about their rhizomes and callus growth optimization, but their total content and antioxidant activities are not very . This study aims to study the total content and antioxidant activities of callus of K.. This study is to determine the type and concentration of hormone that give the best effect on the growth of callus in culture from different parts (, and basal part) of K.. Different concentrations were tested with medium 2,4-dichlorophenoxyacetic acid (2,4-D) and acid (NAA) in callus cultivation. The highest total content tested in callus is one with 10.00 mg/L 2,4-D from the part of the plant. The highest antioxidant activity is from the part of the plant with 5.00 mg/L 2,4-D.

scholarly journals Antioxidant activity of different parts of Dolsan Leaf Mustard

2016 ◽  
Vol 25 (5) ◽  
pp. 1463-1467 ◽  
Author(s):  
SunKyung Oh ◽  
KiWoong Kim ◽  
MyeongRak Choi
Keyword(s):  
Antioxidant Activity ◽  
Different Parts
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